Protective effects of manidipine on spermatogenesis in stroke-prone spontaneously hypertensive rats

1. We evaluated the protective effects of manidipine on spermatogenic damage induced by the hypertensive vascular changes in stroke-prone spontaneously hypertensive rats (SHRSP). 2. Blood pressure reached more than 250 mmHg in SHRSP at 15 weeks of age, and thereafter the hypertensive changes in testicular arterioles developed. Manidipine reduced both the blood pressure and the hypertensive vascular changes. 3. Although immature and mature spermatids greatly diminished in SHRSP at 23 weeks of age, manidipine could preserve almost normal spermatogenesis even at 23 weeks of age. Transferrin concentration in testicular cytosol, which was considered to be indicative of the Sertoli cell function, in SHRSP with manidipine administration was significantly higher than that in SHRSP with no treatment at 23 weeks of age. 4. In conclusion, manidipine could prevent the development of the hypertensive changes in intratesticular arterioles and maintain normal Sertoli cell function. As a result, manidipine protected spermatogenic damage in SHRSP.